Visualization of Microvascular that Assumes an Ultra-High Field MRI with High Precision Frequency Analysis

In recent years, with the development of medical equipment technology, tomograms have become important. As for Magnetic Resonance Imaging (MRI) in particular, study of the device that provides a tomographic image has become active. One technique to visualize blood vessels using MRI is called Magnetic Resonance Angiography (MRA). Fast Fourier transform (FFT) is used for analysis of the MRI, and the resolution of the FFT depends on the magnetic field strength. We focused on Non-harmonic Analysis (NHA). NHA has a frequency resolution that is much higher than FFT. Therefore, there is possibility that NHA can be visualized microstructure measured by ultra-high field MRI. In the experiment, we investigated the resolution of NHA by computer simulation. From the results, the FFT could not to express an original phantom, owing to the lack of resolution. On the other hand, NHA was able to exactly express an observation object and greatly reduce the occurrence of side lobes.